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High-precision dynamic measurement method for tension of damped suspender system

A high-precision, boom technology, used in force/torque/work measuring instruments, measuring devices, instruments, etc., to solve problems such as insufficient accuracy

Active Publication Date: 2021-01-05
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a high-precision dynamic measurement method for the tension of the damping boom system, so as to solve the problem of insufficient precision in the prior art

Method used

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  • High-precision dynamic measurement method for tension of damped suspender system
  • High-precision dynamic measurement method for tension of damped suspender system
  • High-precision dynamic measurement method for tension of damped suspender system

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Embodiment

[0178] The application of this method is illustrated below in conjunction with the examples, and compared with the practical formula method proposed by Zui et al. (1996). The practical formula proposed by Zui et al. (1996) is as follows:

[0179]

[0180] in:

[0181] In this embodiment, the problem of force measurement by vibration method of two actual arch bridge suspenders is discussed. The boom is composed of 91 steel wires with a diameter of 7mm. The elastic modulus of the steel wire is 1.95e+005MPa, the mass per unit length of the boom is 27.48kg / m, and the cross-sectional area of ​​the boom is 0.0035mm 2 . Table 1 gives the mechanical parameters of two booms, one of which is a short boom (2.34m) and the other is a long boom (10.2m). The boundary rotation and lateral stiffness of the boom are respectively 12EI / l and 48EI / l 3 . The stiffness and damping values ​​of the damper are selected according to the normal range. At this time, the short boom and long boom f...

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Abstract

The invention discloses a high-precision dynamic measurement method for the tension of a damped suspender system. The method comprises the following steps: establishing a vibration control differential equation and a dynamic characteristic value equation of the suspender system considering the influence of additional mass, boundary rotational rigidity and a shock absorber; solving through a finitedifference method to obtain a dynamic characteristic value equation in a matrix form; solving a derivative function of the frequency of the suspender system to the tension, the bending rigidity, theboundary rotation rigidity and the shock absorber damping based on the matrix eigenvalue derivative; constructing a parameter sensitivity matrix based on the derivative function of the suspender frequency; establishing an inversion algorithm of suspender system parameters according to the parameter sensitivity matrix and a least square method; obtaining a plurality of target frequency values through an additional mass method; calculating and obtaining a plurality of estimated frequencies according to the estimated system parameters; and calculating system parameters under a given frequency according to the target frequency value, the estimated frequency and an inversion algorithm. The method provided by the invention solves the problems of short suspender force measurement and damped suspender system force measurement in actual engineering.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a high-precision dynamic measurement method for the tension of a damping suspender system. Background technique [0002] The test of cable force and hanger force is an important issue in bridge inspection and construction monitoring, and its test accuracy is of great significance for the safety monitoring of bridges in construction and operation stages. The existing cable force testing methods include oil pressure gauge method, pressure sensor method, vibration frequency method and magnetic flux method, among which the vibration frequency method has been widely used in engineering because of its convenience and speed. However, the accuracy of the vibration frequency method is affected by factors such as the sag effect of the cable, bending stiffness, boundary conditions and dampers, and the range of application of the theoretical formula is limited. [000...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F30/23G01L5/00G06F119/14
CPCG06F30/13G06F30/23G01L5/00G06F2119/14
Inventor 马麟许辉付春雨
Owner HOHAI UNIV
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